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Enhanced caching service for frequently accessed data and responses.
This module provides intelligent caching for chat responses, language contexts,
and other frequently accessed data to improve performance.
"""
import json
import logging
import hashlib
import time
from typing import Any, Optional, Dict, List, Union
from datetime import datetime, timedelta
from dataclasses import dataclass, asdict
import redis
from redis.exceptions import RedisError
logger = logging.getLogger(__name__)
@dataclass
class CacheEntry:
"""Represents a cached entry with metadata."""
key: str
value: Any
created_at: datetime
expires_at: Optional[datetime] = None
hit_count: int = 0
last_accessed: Optional[datetime] = None
tags: List[str] = None
def __post_init__(self):
if self.tags is None:
self.tags = []
class CacheService:
"""Enhanced caching service with intelligent cache management."""
def __init__(self, redis_client: Optional[redis.Redis] = None):
"""
Initialize cache service.
Args:
redis_client: Redis client instance (optional)
"""
self.redis_client = redis_client
self.cache_prefix = "chat_cache:"
self.stats_prefix = "cache_stats:"
self.tag_prefix = "cache_tags:"
# Cache configuration
self.default_ttl = 3600 # 1 hour
self.max_response_cache_size = 1000 # Max cached responses
self.response_cache_ttl = 1800 # 30 minutes for responses
self.language_context_ttl = 86400 # 24 hours for language contexts
# Performance tracking
self.cache_hits = 0
self.cache_misses = 0
self.cache_errors = 0
logger.info("Cache service initialized", extra={
'redis_enabled': bool(redis_client),
'default_ttl': self.default_ttl
})
def _generate_cache_key(self, namespace: str, identifier: str) -> str:
"""Generate cache key with namespace."""
return f"{self.cache_prefix}{namespace}:{identifier}"
def _serialize_value(self, value: Any) -> str:
"""Serialize value for caching."""
if isinstance(value, (dict, list)):
return json.dumps(value, default=str)
elif isinstance(value, datetime):
return value.isoformat()
else:
return str(value)
def _deserialize_value(self, value: str, value_type: type = None) -> Any:
"""Deserialize cached value."""
if value_type == datetime:
return datetime.fromisoformat(value)
try:
# Try to parse as JSON first
return json.loads(value)
except (json.JSONDecodeError, TypeError):
# Return as string if JSON parsing fails
return value
def _hash_content(self, content: str) -> str:
"""Generate hash for content-based caching."""
return hashlib.md5(content.encode('utf-8')).hexdigest()
def set(self, namespace: str, key: str, value: Any, ttl: Optional[int] = None,
tags: Optional[List[str]] = None) -> bool:
"""
Set a value in cache.
Args:
namespace: Cache namespace
key: Cache key
value: Value to cache
ttl: Time to live in seconds
tags: Tags for cache invalidation
Returns:
True if successful, False otherwise
"""
if not self.redis_client:
return False
try:
cache_key = self._generate_cache_key(namespace, key)
serialized_value = self._serialize_value(value)
# Set value with TTL
ttl = ttl or self.default_ttl
success = self.redis_client.setex(cache_key, ttl, serialized_value)
# Store metadata
if success and tags:
self._store_cache_metadata(cache_key, tags, ttl)
# Update stats
self._update_cache_stats('set', namespace)
logger.debug(f"Cached value for key: {cache_key}")
return bool(success)
except RedisError as e:
logger.warning(f"Failed to set cache value: {e}")
self.cache_errors += 1
return False
def get(self, namespace: str, key: str, value_type: type = None) -> Optional[Any]:
"""
Get a value from cache.
Args:
namespace: Cache namespace
key: Cache key
value_type: Expected value type for deserialization
Returns:
Cached value or None if not found
"""
if not self.redis_client:
return None
try:
cache_key = self._generate_cache_key(namespace, key)
cached_value = self.redis_client.get(cache_key)
if cached_value is not None:
self.cache_hits += 1
self._update_cache_stats('hit', namespace)
# Update access metadata
self._update_access_metadata(cache_key)
# Deserialize and return
return self._deserialize_value(cached_value.decode('utf-8'), value_type)
else:
self.cache_misses += 1
self._update_cache_stats('miss', namespace)
return None
except RedisError as e:
logger.warning(f"Failed to get cache value: {e}")
self.cache_errors += 1
self.cache_misses += 1
return None
def delete(self, namespace: str, key: str) -> bool:
"""
Delete a value from cache.
Args:
namespace: Cache namespace
key: Cache key
Returns:
True if successful, False otherwise
"""
if not self.redis_client:
return False
try:
cache_key = self._generate_cache_key(namespace, key)
deleted = self.redis_client.delete(cache_key)
# Clean up metadata
self._cleanup_cache_metadata(cache_key)
self._update_cache_stats('delete', namespace)
return bool(deleted)
except RedisError as e:
logger.warning(f"Failed to delete cache value: {e}")
self.cache_errors += 1
return False
def invalidate_by_tags(self, tags: List[str]) -> int:
"""
Invalidate all cache entries with specified tags.
Args:
tags: List of tags to invalidate
Returns:
Number of entries invalidated
"""
if not self.redis_client or not tags:
return 0
try:
invalidated_count = 0
for tag in tags:
tag_key = f"{self.tag_prefix}{tag}"
cache_keys = self.redis_client.smembers(tag_key)
if cache_keys:
# Delete all keys with this tag
deleted = self.redis_client.delete(*cache_keys)
invalidated_count += deleted
# Clean up tag set
self.redis_client.delete(tag_key)
logger.info(f"Invalidated {invalidated_count} cache entries for tags: {tags}")
return invalidated_count
except RedisError as e:
logger.warning(f"Failed to invalidate cache by tags: {e}")
return 0
def cache_response(self, prompt: str, language: str, response: str,
metadata: Optional[Dict] = None) -> bool:
"""
Cache a chat response for similar prompts.
Args:
prompt: User prompt
language: Programming language
response: Generated response
metadata: Additional metadata
Returns:
True if cached successfully
"""
# Generate cache key based on prompt and language
prompt_hash = self._hash_content(f"{prompt}:{language}")
cache_key = f"response:{prompt_hash}"
cache_data = {
'prompt': prompt,
'language': language,
'response': response,
'metadata': metadata or {},
'cached_at': datetime.utcnow().isoformat()
}
tags = [f"language:{language}", "responses"]
return self.set("responses", cache_key, cache_data,
ttl=self.response_cache_ttl, tags=tags)
def get_cached_response(self, prompt: str, language: str) -> Optional[Dict]:
"""
Get cached response for similar prompt.
Args:
prompt: User prompt
language: Programming language
Returns:
Cached response data or None
"""
prompt_hash = self._hash_content(f"{prompt}:{language}")
cache_key = f"response:{prompt_hash}"
return self.get("responses", cache_key)
def cache_language_context(self, session_id: str, language: str,
context_data: Dict) -> bool:
"""
Cache language context for a session.
Args:
session_id: Session identifier
language: Programming language
context_data: Language context data
Returns:
True if cached successfully
"""
cache_key = f"context:{session_id}"
cache_data = {
'session_id': session_id,
'language': language,
'context_data': context_data,
'cached_at': datetime.utcnow().isoformat()
}
tags = [f"session:{session_id}", f"language:{language}", "contexts"]
return self.set("language_contexts", cache_key, cache_data,
ttl=self.language_context_ttl, tags=tags)
def get_cached_language_context(self, session_id: str) -> Optional[Dict]:
"""
Get cached language context for a session.
Args:
session_id: Session identifier
Returns:
Cached context data or None
"""
cache_key = f"context:{session_id}"
return self.get("language_contexts", cache_key)
def cache_session_data(self, session_id: str, session_data: Dict,
ttl: Optional[int] = None) -> bool:
"""
Cache session data for quick access.
Args:
session_id: Session identifier
session_data: Session data to cache
ttl: Time to live (defaults to 1 hour)
Returns:
True if cached successfully
"""
cache_key = f"session:{session_id}"
cache_data = {
'session_data': session_data,
'cached_at': datetime.utcnow().isoformat()
}
tags = [f"session:{session_id}", "sessions"]
return self.set("sessions", cache_key, cache_data,
ttl=ttl or 3600, tags=tags)
def get_cached_session_data(self, session_id: str) -> Optional[Dict]:
"""
Get cached session data.
Args:
session_id: Session identifier
Returns:
Cached session data or None
"""
cache_key = f"session:{session_id}"
cached = self.get("sessions", cache_key)
if cached:
return cached.get('session_data')
return None
def _store_cache_metadata(self, cache_key: str, tags: List[str], ttl: int):
"""Store cache metadata for tag-based invalidation."""
try:
# Store tags for this cache key
for tag in tags:
tag_key = f"{self.tag_prefix}{tag}"
self.redis_client.sadd(tag_key, cache_key)
self.redis_client.expire(tag_key, ttl + 300) # Expire tags 5 minutes after cache
except RedisError as e:
logger.warning(f"Failed to store cache metadata: {e}")
def _cleanup_cache_metadata(self, cache_key: str):
"""Clean up metadata for deleted cache key."""
try:
# This is a simplified cleanup - in production, you might want
# to maintain a reverse index for more efficient cleanup
pass
except RedisError as e:
logger.warning(f"Failed to cleanup cache metadata: {e}")
def _update_access_metadata(self, cache_key: str):
"""Update access metadata for cache key."""
try:
# Increment hit count
hit_key = f"{cache_key}:hits"
self.redis_client.incr(hit_key)
self.redis_client.expire(hit_key, self.default_ttl)
# Update last accessed time
access_key = f"{cache_key}:last_access"
self.redis_client.set(access_key, datetime.utcnow().isoformat(), ex=self.default_ttl)
except RedisError as e:
logger.warning(f"Failed to update access metadata: {e}")
def _update_cache_stats(self, operation: str, namespace: str):
"""Update cache statistics."""
if not self.redis_client:
return
try:
stats_key = f"{self.stats_prefix}{namespace}:{operation}"
self.redis_client.incr(stats_key)
self.redis_client.expire(stats_key, 86400) # Keep stats for 24 hours
except RedisError as e:
logger.warning(f"Failed to update cache stats: {e}")
def get_cache_stats(self) -> Dict[str, Any]:
"""
Get cache performance statistics.
Returns:
Dictionary with cache statistics
"""
total_requests = self.cache_hits + self.cache_misses
hit_rate = (self.cache_hits / total_requests * 100) if total_requests > 0 else 0
stats = {
'cache_hits': self.cache_hits,
'cache_misses': self.cache_misses,
'cache_errors': self.cache_errors,
'hit_rate_percent': round(hit_rate, 2),
'total_requests': total_requests,
'redis_enabled': bool(self.redis_client)
}
# Get Redis-specific stats if available
if self.redis_client:
try:
info = self.redis_client.info()
stats.update({
'redis_memory_used': info.get('used_memory_human', 'N/A'),
'redis_connected_clients': info.get('connected_clients', 0),
'redis_keyspace_hits': info.get('keyspace_hits', 0),
'redis_keyspace_misses': info.get('keyspace_misses', 0)
})
except RedisError as e:
logger.warning(f"Failed to get Redis stats: {e}")
return stats
def clear_namespace(self, namespace: str) -> int:
"""
Clear all cache entries in a namespace.
Args:
namespace: Namespace to clear
Returns:
Number of entries cleared
"""
if not self.redis_client:
return 0
try:
pattern = f"{self.cache_prefix}{namespace}:*"
keys = self.redis_client.keys(pattern)
if keys:
deleted = self.redis_client.delete(*keys)
logger.info(f"Cleared {deleted} cache entries from namespace: {namespace}")
return deleted
return 0
except RedisError as e:
logger.warning(f"Failed to clear namespace {namespace}: {e}")
return 0
def warm_cache(self, data_loader_func, namespace: str, keys: List[str],
ttl: Optional[int] = None):
"""
Warm cache with data from a loader function.
Args:
data_loader_func: Function to load data for cache warming
namespace: Cache namespace
keys: List of keys to warm
ttl: Time to live for cached entries
"""
if not self.redis_client:
return
logger.info(f"Warming cache for namespace: {namespace}")
for key in keys:
try:
# Check if already cached
if self.get(namespace, key) is not None:
continue
# Load data and cache it
data = data_loader_func(key)
if data is not None:
self.set(namespace, key, data, ttl=ttl)
except Exception as e:
logger.warning(f"Failed to warm cache for key {key}: {e}")
logger.info(f"Cache warming completed for namespace: {namespace}")
# Global cache service instance
_cache_service: Optional[CacheService] = None
def initialize_cache_service(redis_client: Optional[redis.Redis] = None) -> CacheService:
"""
Initialize global cache service.
Args:
redis_client: Redis client instance
Returns:
CacheService instance
"""
global _cache_service
if _cache_service is None:
_cache_service = CacheService(redis_client)
return _cache_service
def get_cache_service() -> Optional[CacheService]:
"""
Get the global cache service.
Returns:
CacheService instance or None if not initialized
"""
return _cache_service |